关键词: 电渗析, 模型, 传质, 分离, 模拟

Abstract:

Electrodialysis is a mass separation process in which ion exchange membranes and electrical potential difference are used to separate ionic species from aqueous solution and other uncharged components. This separation technology possesses the advantages of strong adaptability, simple pretreatment of feed, low energy consumption and little environmental pollution, which make it widely applied in separation and purification processes of chemical and biological industries. This review covers six mass transfer models used in the description of mass transportation phenomena and summarizes the advantages and problems of these models. It is pointed out in this paper that the main limitation for further improvement of electrodialysis technology is that it is troublesome to theoretically or experimentally study the electrodialysis process that includes a number of complex phenomena such as mass transportation, concentration polarization, fluid flow behavior and electrolyte-membrane equilibrium. Mass transfer modeling of electrodialysis, which is favorable to deeply study mass transfer mechanism for accurate performance prediction and target-oriented process optimization, provides an effective strategy to study the separation process of electrodialysis. Moreover, the research direction is optimization of mass transfer models by combining empirical equations or transfer coefficients, and simulation of electrodialysis process with modeling tools, aiming to improve the accuracy and universality of mass transfer models.

Key words: electrodialysis, model, mass transfer, separation, simulation